How to Troubleshoot OpenAPI Errors in Correct 'inputSpec' for Code Generation?

How can I resolve OpenAPI errors when my 'inputSpec' appears to be correct for code generation?

```json
{
  "openapi": "3.0.1",
  "info": {
    "title": "API Title",
    "version": "1.0.0"
  },
  "paths": {
    "/endpoint": {
      "get": {
        "summary": "Example endpoint",
        "responses": {
          "200": {
            "description": "Successful response"
          }
        }
      }
    }
  }
}
```

OpenAPI specification errors can stem from various structural issues in your 'inputSpec', even if it appears correct at first glance. This guide helps you identify common mistakes and provides solutions to resolve these errors effectively.

```bash
yarn openapi-generator-cli generate -i inputSpec.yaml -g <language> -o outputDirectory
```

Causes

• Invalid syntax in the OpenAPI document, such as mismatched braces or incorrect indentation.
• Using an unsupported version of OpenAPI specific to the generator or tooling.
• Missing or incorrectly implemented required fields in the 'info' or 'paths' sections.
• Inconsistent naming or URI patterns for paths that don't follow OpenAPI guidelines.

Solutions

• Validate your OpenAPI specification using tools like Swagger Editor or OpenAPI Generator to pinpoint errors.
• Ensure all required fields, such as 'info', 'version', and 'paths', are correctly defined and populated.
• Review your API paths for consistency and adherence to OpenAPI standards.
• Test with different versions of OpenAPI to ensure compatibility with your code generator and tools.

Mistake: Omitting required properties in the OpenAPI specification.

Solution: Refer to the OpenAPI documentation to ensure all mandatory fields are included.

Mistake: Using an incorrect JSON format, which confuses parsers.

Solution: Validate the JSON format using JSON linting tools.